Chronic traumatic encephalopathy, or CTE, is a brain brain disease related to repeated successes in the head, often seen in military veterans and athletes, including soccer players, hockey players and boxers.
It causes symptoms, which generally appear years after trauma in the head, including memory loss, humor changes, confusion and problems of thinking clearly.
The 27 -year -old man who allegedly shot and killed four people in a building in the Midtown Manhattan office on Monday wore a note in his pocket claiming that he suffered from the disease, police sources told ABC News, although until now there is no evidence to confirm that he had the condition.
The suspect Shane Tamura died for suicide after Monday shooting in Mass in 345 Park Avenue, police said. Tamura, 27, played high school football in Los Angeles, but did not play professionally, according to Fuentes. The police have not found evidence until the moment they suffered a traumatic brain injury, the sources said.
There is currently no evidence of a relationship between the suspect and the army or the NFL.
CTE cannot be diagnosed in a living person with certainty, but doctors can suspect depending on the symptoms and history of trauma in the head.
The only way to confirm CTE is through an autopsy of specialists looking for specific changes in the brain.
Police and others meet in a crime scene in downtown Manhattan after two people, including a police officer, were fired inside an office building on July 28, 2025 in New York City.
Spencer Platt/Getty Images
Researchers analyze the autopsy of the brain to look for changes in Tau proteins, found in neurons, which define CTE.
Boston University Unite Brain Bank It has more than 1,500 donated brains, including more than 800 confirmed cases of CTE.
Most donors were military athletes or veterans with a history of repeated head impacts.
ABC News Aaron Katersky contributed to this report.
